I have been on Lithium for 20 years with a break of about 18 months somewhere in the 90's!
It worked very well for me tho with various anti dep's but I am about to have Depakote added to the mix as I have been in a persistant depressive state for months and months.
Give it a go, tho take it with food to lessen side effects. Drink plenty and get your bloods done and see what happens.
All the best